Drawing die



Dec. 7, 1937. H. H. RICHARDSON DRAWI G DIE Filed Juiy 3 1936 Inn ntnr 4 HHRIEHFIEDSDN Patented Dec. 7, 1937 UNITED] STATES 2,1th8t PATENT Ic 2,101,639 DRAWING DIE Harry Hamilton ltichardson, Hamilton, Ontario,

7 Canada i raise July s, 1936, Serial Na. 88,868 10 Claims. (01105-) centre, the die in the housing. *Moreovermwhen' such sector shaped l dies; become worn it is im possibletoresize themfor drawing a shaper'of the samez cross sectional dimensions as it originally drew. r w w. i s

The 'presentinventionhas foran object to de-r vise a-die composedof a number of substantially sector shaped portions so formedas to be capable of insertion into ahousing whereinthey'will be accurately centered thusproducing :bars of required' shapes which are fins; 1 L

further object is to devise a die in which when; worn the sector shaped portions maybe reground and so inserted into the housing and adjusted-therein that they will draw'a' bar of the same crossesectional dimensions as the die was originally-intended for A still "further object is to devise a die for the above purpose inl'rwhich the-sector shaped portions will lend themselves susceptible to being accurately gauged to ensure their uniformity with other-sector shaped portions: priorcto insertion intotthe'housingl f a e Withthe above and other objects which-will hereinafter appear as the specification proceeds -my invention :consists, in'its preferredembodimentt'of a die constructed and arranged all as hereinafter more particularly-described and illustratedminp the accompanying: drawing in Fig; l'represents ,a side elevation of my die showing the-same inserted in a holder of acold drawing "machinef Fig. '2'is a frontview of my die shown from 0 Fig". I is a similar section showing reground sector portions of the die ,so disposed .in the housing iasfto draw @a bar of the same cross-sectional j dimensions "as wouldfthe die illustrated in Figs. 2 and 3,.and f o e e 5 is' a perspective,detaildrawn to an en- -of a cold drawing machine. Obviously the housuniform t and without larged scale showing one of the substantially sec- .tor shaped portions of my die.

Like characters of reference indicate corresponding parts in the different views.

Asillustrated my die is of a construction suitv '5 able for drawing a bar of hexagon cross-section.

My die-comprises a-housing 1 preferably having a truncated conical exterior 2 for insertion into the'truncated conical interior of thedie holder3 ingl could, in lieu of the form shown; be so con structed as to be held in the holder 3 in any suitable manner. 7 I r 1 vThe interior 4 of the housing is cylindrical and has a comparatively small axial orifice 5 at.

one end to receive the drawn bar, its other'end being open andsof substantially the diameter of the cylindrical interior 4. The interior of the .lipyofv the vhousing is, threaded into which is screwed a retaining -ring'6.

A die sector holding ring I has a cylindrical exterior 8 of substantially the diameterof the interiorA or the housing and ;a. truncated conical interior 9, the smallerend of'the latter being disposed-towards the end -;0f the housing provided with the retaining ring 6, or in other words, towards the bar entering end of the assembled die. Each die sector portion] 0. has its .outer arcuate ,face 1 lv inclined to correspond with the inclination of the interior-9 of the ring 1 and such arouate face is ground offintermediately of the ends to give a two point'contact on such truncated conical interior 9 of the'die sector holding ring 1. The forward-end of the .bar engaging face ll! of each die sector portion is ground arcuately outward to givea, mouth for. the reception of the bar to be drawn when the sector portions are assembled. a

A circular plate I 3 having 'a circular boss M, the latter inserted into the orifice 5, -is interposed between the die] sector'portions and the rear wall of the housing I and suchplate isof such diameter that it may enter the truncated conical interior of the die sector holding ring 1 from the larger end of the latter. 5

'All the parts above referred toare disposed concentrically in the interior 4 of the housing I.

5 In assembling the die, the sector portions it are assembled in. the die sector holding ring 1 with 5 their arcuate faces ll engaging the truncated conical interior '9 of the ring and their radially disposed surfaces abutting the corresponding surfaces of adjacent die sector portions, the mouth formed by, the arcuate forward ends of the faces 5 [2 being directed towards the bar entering end of the die.

The die sector holding ring I with the die sectors therein is then inserted into the housing with the larger end of its truncated conical interior 9 directed towards the plate I3 wherein the latter abuts the rear ends of the sectors when the retaining ring 6 is screwed up against the forward face of the ring I thus forcing the sectors into intimate contact with each other and with the interior 9 of such ring 1. Consequently the sector die assembly is accurately centred and retained in the housing and bars drawn through the die are uniformly sized.

Upon the bar engaging faces [2 of the sectors becoming worn through continual drawing by unscrewing the retaining ring 6 and removing the die sector holding ring I with the assembled sectors therein the latter may be removed and reground. When the faces I 2 of the sectors have been reground the outer inclined arcuate faces I I can be ground off commensurately to enable the outer truncated conical periphery of the die sector assembly when replaced in the ring 7 to be disposed a further extent forwardly in the interior 9 of such ring. When the ring 1 with assembled die sectors is replaced in the housing I and the retaining ring 6 is again screwed up the plate I3 will enter the interior 9 of the ring I and thus force the sectors home as above described and as illustrated in Fig. 4. Thus the refaced die sectors assembly will draw a bar of the same crosssectional dimensions as was the case originally.

A die assembly as described and illustrated above in addition to accurately and uniformly drawing bars and being capable of being refaced to draw bars of the same cross-sectional dimensions possesses the advantages that both initially and when refaced the sectors can be ground independently in a suitable grinding and gauging machine or machines so that all sectors are identical:

Although I have described and illustrated my die assembly as being applicable for drawing hexagon bars by changing the number and/or the conformation of the sectors, bars of an infinite variety of polygonal shapes can be drawn.

What I claim as my invention is:

1. A die for cold drawing steel bars into polygon shapes comprising a housing, a single die sector holding ring inserted into the housing, a plurality of substantially sector shaped portions assembled in the die sector holding ring with their radial faces abutting each other and their bar engaging faces forming an opening of the polygonal shape of the bar to be drawn therethrough, said die sector holding ring being operable longitudinally with respect to such sector shaped portions, and retaining means adjustably disposed in the housing and engaging the die sector holding ring.

2. A die for cold drawing steel bars into polygonal shapes comprising a housing, a die sector holding ring, a plurality of die sectors each having an arcuate outer face, radially extending side faces and an .inner bar drawing face, said die sectors being assembled in the die sector holding ring with their radial faces in abutting relation, their bar drawing faces forming an opening of the polygonal shape of the bar to be drawn therethrough and their arcuate outer faces engaging the interior of the die sector holding ring, said die sector holding ring being inserted into the interior of the housing, and means for removably retaining the die sector holding ring and die sectors in the housing,

3. A die as claimed in claim 2 wherein means is provided in the housing for engaging the die sectors and forcing them into intimate contact with each other upon the retaining means being actuated.

4. A die as claimed in claim 2 wherein the means for removably retaining the die sector holding ring and die sectors in the housing comprises a retaining ring threaded into the interior of the housing and engaging the die sector holding ring.

5. A die as claimed in claim 2 wherein a plate is disposed in the housing engaging the rear faces of the die sectors and forcing them forwardly into intimate contact with each other upon the retaining means being actuated.

6. A die for cold drawing steel bars into polygonal shapes comprising a housing having a cylindrical interior open at its forward or bar entering end and its closed rear end having an axial bar receiving orifice therethrough, a cylindrical die sector holding ring disposed in the cylindrical interior of the housing and having a concentric truncated conical interior with its smaller end directed towards the forward end of the housing,

a plurality of substantially sector shaped portions disposed in the truncated conical interior of the die sector holding ring with their radial faces in abutment with each other and their bar engaging or drawing faces forming an opening of the polygonal shape of the bar to be drawn, said sector shaped portions having arcuate outer faces inclined inwardly in a longitudinal direction from forward to rear end to correspond with the inclination of the truncated conical interior of the die sector holding ring and engageable therewith,

taining ring threaded into the open forward end of the housing and engageable with the die sector holding ring.

' 8. A die as claimed in claim 6 wherein a circular plate having a boss insertable into the orifice in the rear end of the housing is' interposed between the latter and the rear ends of the sector shaped die portions, said plate being of a diameter capable of entering the truncated conical interior of the die sector holding ring.

9. A die for cold drawing steel bars into polygonal shapes comprising a housing having a cylin drical interior open at its forward or bar entering end and its closed rear' end having an axial bar receivingorifice therethrough, a cylindrical die sector holding ring disposed in the cylindrical interior of the housing and having a concentric truncated conical interior with its smaller end directed towards the forward end of the housing, a plurality of substantially sector shaped portions disposed in the truncated'conical interior of the die sector holding ring with their radial faces in abutment with each other and their bar engaging or drawing faces forming an opening ofv the polygonal shape of the bar to be drawn, said sector shaped portions having arcuate outer faces inclined inwardly in a longitudinal direction from forward to rear end to cor-' respond with the inclination of the truncated conical interior of the die sector holding ring and engageable therewith, a circular plate disposed concentrically on the forward face of the rear end of the housing engaging the rear faces of the sector shaped portions and of a diameter capable of entering the truncated conical interior of the die sector holding ring, and a retaining ring threaded into the forward end of the'housing and engaging the die'sector holding ring.

10.-In a die for cold drawing steel bars into polygon shapes, the combination with a die sector holding ring'having its interior tapering inwardly towards its bar entering face, of a plurality of die sectors, each having an arcuate outer face of substantiallythe radius of the interior of the die sector holding ring and tapering correspondingly thereto, radially extending side faces, and an inner bar drawing face, said die sectors being assembledin the die sector holding ring with their radial faces in abutment with each other, their bar drawing faces forming an opening of the polygonal shape of the bar to be drawn therethrough and their arcuate outer faces engaging the interior of the die sector holding ring.

HARRY HAMILTON RICHARDSON. 

